1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * battery.c - ACPI Battery Driver (Revision: 2.0)
4 *
5 * Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
6 * Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
7 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
8 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
9 */
10
11 #define pr_fmt(fmt) "ACPI: battery: " fmt
12
13 #include <linux/delay.h>
14 #include <linux/dmi.h>
15 #include <linux/jiffies.h>
16 #include <linux/kernel.h>
17 #include <linux/list.h>
18 #include <linux/module.h>
19 #include <linux/mutex.h>
20 #include <linux/slab.h>
21 #include <linux/suspend.h>
22 #include <linux/types.h>
23
24 #include <asm/unaligned.h>
25
26 #include <linux/acpi.h>
27 #include <linux/power_supply.h>
28
29 #include <acpi/battery.h>
30
31 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
32 #define ACPI_BATTERY_CAPACITY_VALID(capacity) \
33 ((capacity) != 0 && (capacity) != ACPI_BATTERY_VALUE_UNKNOWN)
34
35 #define ACPI_BATTERY_DEVICE_NAME "Battery"
36
37 /* Battery power unit: 0 means mW, 1 means mA */
38 #define ACPI_BATTERY_POWER_UNIT_MA 1
39
40 #define ACPI_BATTERY_STATE_DISCHARGING 0x1
41 #define ACPI_BATTERY_STATE_CHARGING 0x2
42 #define ACPI_BATTERY_STATE_CRITICAL 0x4
43 #define ACPI_BATTERY_STATE_CHARGE_LIMITING 0x8
44
45 #define MAX_STRING_LENGTH 64
46
47 MODULE_AUTHOR("Paul Diefenbaugh");
48 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
49 MODULE_DESCRIPTION("ACPI Battery Driver");
50 MODULE_LICENSE("GPL");
51
52 static int battery_bix_broken_package;
53 static int battery_notification_delay_ms;
54 static int battery_ac_is_broken;
55 static unsigned int cache_time = 1000;
56 module_param(cache_time, uint, 0644);
57 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
58
59 static const struct acpi_device_id battery_device_ids[] = {
60 {"PNP0C0A", 0},
61
62 /* Microsoft Surface Go 3 */
63 {"MSHW0146", 0},
64
65 {"", 0},
66 };
67
68 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
69
70 enum {
71 ACPI_BATTERY_ALARM_PRESENT,
72 ACPI_BATTERY_XINFO_PRESENT,
73 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
74 /* On Lenovo Thinkpad models from 2010 and 2011, the power unit
75 * switches between mWh and mAh depending on whether the system
76 * is running on battery or not. When mAh is the unit, most
77 * reported values are incorrect and need to be adjusted by
78 * 10000/design_voltage. Verified on x201, t410, t410s, and x220.
79 * Pre-2010 and 2012 models appear to always report in mWh and
80 * are thus unaffected (tested with t42, t61, t500, x200, x300,
81 * and x230). Also, in mid-2012 Lenovo issued a BIOS update for
82 * the 2011 models that fixes the issue (tested on x220 with a
83 * post-1.29 BIOS), but as of Nov. 2012, no such update is
84 * available for the 2010 models.
85 */
86 ACPI_BATTERY_QUIRK_THINKPAD_MAH,
87 /* for batteries reporting current capacity with design capacity
88 * on a full charge, but showing degradation in full charge cap.
89 */
90 ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE,
91 };
92
93 struct acpi_battery {
94 struct mutex lock;
95 struct mutex sysfs_lock;
96 struct power_supply *bat;
97 struct power_supply_desc bat_desc;
98 struct acpi_device *device;
99 struct notifier_block pm_nb;
100 struct list_head list;
101 unsigned long update_time;
102 int revision;
103 int rate_now;
104 int capacity_now;
105 int voltage_now;
106 int design_capacity;
107 int full_charge_capacity;
108 int technology;
109 int design_voltage;
110 int design_capacity_warning;
111 int design_capacity_low;
112 int cycle_count;
113 int measurement_accuracy;
114 int max_sampling_time;
115 int min_sampling_time;
116 int max_averaging_interval;
117 int min_averaging_interval;
118 int capacity_granularity_1;
119 int capacity_granularity_2;
120 int alarm;
121 char model_number[MAX_STRING_LENGTH];
122 char serial_number[MAX_STRING_LENGTH];
123 char type[MAX_STRING_LENGTH];
124 char oem_info[MAX_STRING_LENGTH];
125 int state;
126 int power_unit;
127 unsigned long flags;
128 };
129
130 #define to_acpi_battery(x) power_supply_get_drvdata(x)
131
acpi_battery_present(struct acpi_battery * battery)132 static inline int acpi_battery_present(struct acpi_battery *battery)
133 {
134 return battery->device->status.battery_present;
135 }
136
acpi_battery_technology(struct acpi_battery * battery)137 static int acpi_battery_technology(struct acpi_battery *battery)
138 {
139 if (!strcasecmp("NiCd", battery->type))
140 return POWER_SUPPLY_TECHNOLOGY_NiCd;
141 if (!strcasecmp("NiMH", battery->type))
142 return POWER_SUPPLY_TECHNOLOGY_NiMH;
143 if (!strcasecmp("LION", battery->type))
144 return POWER_SUPPLY_TECHNOLOGY_LION;
145 if (!strncasecmp("LI-ION", battery->type, 6))
146 return POWER_SUPPLY_TECHNOLOGY_LION;
147 if (!strcasecmp("LiP", battery->type))
148 return POWER_SUPPLY_TECHNOLOGY_LIPO;
149 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
150 }
151
152 static int acpi_battery_get_state(struct acpi_battery *battery);
153
acpi_battery_is_charged(struct acpi_battery * battery)154 static int acpi_battery_is_charged(struct acpi_battery *battery)
155 {
156 /* charging, discharging, critical low or charge limited */
157 if (battery->state != 0)
158 return 0;
159
160 /* battery not reporting charge */
161 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
162 battery->capacity_now == 0)
163 return 0;
164
165 /* good batteries update full_charge as the batteries degrade */
166 if (battery->full_charge_capacity == battery->capacity_now)
167 return 1;
168
169 /* fallback to using design values for broken batteries */
170 if (battery->design_capacity <= battery->capacity_now)
171 return 1;
172
173 /* we don't do any sort of metric based on percentages */
174 return 0;
175 }
176
acpi_battery_is_degraded(struct acpi_battery * battery)177 static bool acpi_battery_is_degraded(struct acpi_battery *battery)
178 {
179 return ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) &&
180 ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity) &&
181 battery->full_charge_capacity < battery->design_capacity;
182 }
183
acpi_battery_handle_discharging(struct acpi_battery * battery)184 static int acpi_battery_handle_discharging(struct acpi_battery *battery)
185 {
186 /*
187 * Some devices wrongly report discharging if the battery's charge level
188 * was above the device's start charging threshold atm the AC adapter
189 * was plugged in and the device thus did not start a new charge cycle.
190 */
191 if ((battery_ac_is_broken || power_supply_is_system_supplied()) &&
192 battery->rate_now == 0)
193 return POWER_SUPPLY_STATUS_NOT_CHARGING;
194
195 return POWER_SUPPLY_STATUS_DISCHARGING;
196 }
197
acpi_battery_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)198 static int acpi_battery_get_property(struct power_supply *psy,
199 enum power_supply_property psp,
200 union power_supply_propval *val)
201 {
202 int full_capacity = ACPI_BATTERY_VALUE_UNKNOWN, ret = 0;
203 struct acpi_battery *battery = to_acpi_battery(psy);
204
205 if (acpi_battery_present(battery)) {
206 /* run battery update only if it is present */
207 acpi_battery_get_state(battery);
208 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
209 return -ENODEV;
210 switch (psp) {
211 case POWER_SUPPLY_PROP_STATUS:
212 if (battery->state & ACPI_BATTERY_STATE_DISCHARGING)
213 val->intval = acpi_battery_handle_discharging(battery);
214 else if (battery->state & ACPI_BATTERY_STATE_CHARGING)
215 val->intval = POWER_SUPPLY_STATUS_CHARGING;
216 else if (battery->state & ACPI_BATTERY_STATE_CHARGE_LIMITING)
217 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
218 else if (acpi_battery_is_charged(battery))
219 val->intval = POWER_SUPPLY_STATUS_FULL;
220 else
221 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
222 break;
223 case POWER_SUPPLY_PROP_PRESENT:
224 val->intval = acpi_battery_present(battery);
225 break;
226 case POWER_SUPPLY_PROP_TECHNOLOGY:
227 val->intval = acpi_battery_technology(battery);
228 break;
229 case POWER_SUPPLY_PROP_CYCLE_COUNT:
230 val->intval = battery->cycle_count;
231 break;
232 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
233 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
234 ret = -ENODEV;
235 else
236 val->intval = battery->design_voltage * 1000;
237 break;
238 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
239 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
240 ret = -ENODEV;
241 else
242 val->intval = battery->voltage_now * 1000;
243 break;
244 case POWER_SUPPLY_PROP_CURRENT_NOW:
245 case POWER_SUPPLY_PROP_POWER_NOW:
246 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
247 ret = -ENODEV;
248 else
249 val->intval = battery->rate_now * 1000;
250 break;
251 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
252 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
253 if (!ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
254 ret = -ENODEV;
255 else
256 val->intval = battery->design_capacity * 1000;
257 break;
258 case POWER_SUPPLY_PROP_CHARGE_FULL:
259 case POWER_SUPPLY_PROP_ENERGY_FULL:
260 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity))
261 ret = -ENODEV;
262 else
263 val->intval = battery->full_charge_capacity * 1000;
264 break;
265 case POWER_SUPPLY_PROP_CHARGE_NOW:
266 case POWER_SUPPLY_PROP_ENERGY_NOW:
267 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
268 ret = -ENODEV;
269 else
270 val->intval = battery->capacity_now * 1000;
271 break;
272 case POWER_SUPPLY_PROP_CAPACITY:
273 if (ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity))
274 full_capacity = battery->full_charge_capacity;
275 else if (ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
276 full_capacity = battery->design_capacity;
277
278 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
279 full_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
280 ret = -ENODEV;
281 else
282 val->intval = battery->capacity_now * 100/
283 full_capacity;
284 break;
285 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
286 if (battery->state & ACPI_BATTERY_STATE_CRITICAL)
287 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
288 else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
289 (battery->capacity_now <= battery->alarm))
290 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
291 else if (acpi_battery_is_charged(battery))
292 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
293 else
294 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
295 break;
296 case POWER_SUPPLY_PROP_MODEL_NAME:
297 val->strval = battery->model_number;
298 break;
299 case POWER_SUPPLY_PROP_MANUFACTURER:
300 val->strval = battery->oem_info;
301 break;
302 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
303 val->strval = battery->serial_number;
304 break;
305 default:
306 ret = -EINVAL;
307 }
308 return ret;
309 }
310
311 static const enum power_supply_property charge_battery_props[] = {
312 POWER_SUPPLY_PROP_STATUS,
313 POWER_SUPPLY_PROP_PRESENT,
314 POWER_SUPPLY_PROP_TECHNOLOGY,
315 POWER_SUPPLY_PROP_CYCLE_COUNT,
316 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
317 POWER_SUPPLY_PROP_VOLTAGE_NOW,
318 POWER_SUPPLY_PROP_CURRENT_NOW,
319 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
320 POWER_SUPPLY_PROP_CHARGE_FULL,
321 POWER_SUPPLY_PROP_CHARGE_NOW,
322 POWER_SUPPLY_PROP_CAPACITY,
323 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
324 POWER_SUPPLY_PROP_MODEL_NAME,
325 POWER_SUPPLY_PROP_MANUFACTURER,
326 POWER_SUPPLY_PROP_SERIAL_NUMBER,
327 };
328
329 static const enum power_supply_property charge_battery_full_cap_broken_props[] = {
330 POWER_SUPPLY_PROP_STATUS,
331 POWER_SUPPLY_PROP_PRESENT,
332 POWER_SUPPLY_PROP_TECHNOLOGY,
333 POWER_SUPPLY_PROP_CYCLE_COUNT,
334 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
335 POWER_SUPPLY_PROP_VOLTAGE_NOW,
336 POWER_SUPPLY_PROP_CURRENT_NOW,
337 POWER_SUPPLY_PROP_CHARGE_NOW,
338 POWER_SUPPLY_PROP_MODEL_NAME,
339 POWER_SUPPLY_PROP_MANUFACTURER,
340 POWER_SUPPLY_PROP_SERIAL_NUMBER,
341 };
342
343 static const enum power_supply_property energy_battery_props[] = {
344 POWER_SUPPLY_PROP_STATUS,
345 POWER_SUPPLY_PROP_PRESENT,
346 POWER_SUPPLY_PROP_TECHNOLOGY,
347 POWER_SUPPLY_PROP_CYCLE_COUNT,
348 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
349 POWER_SUPPLY_PROP_VOLTAGE_NOW,
350 POWER_SUPPLY_PROP_POWER_NOW,
351 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
352 POWER_SUPPLY_PROP_ENERGY_FULL,
353 POWER_SUPPLY_PROP_ENERGY_NOW,
354 POWER_SUPPLY_PROP_CAPACITY,
355 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
356 POWER_SUPPLY_PROP_MODEL_NAME,
357 POWER_SUPPLY_PROP_MANUFACTURER,
358 POWER_SUPPLY_PROP_SERIAL_NUMBER,
359 };
360
361 static const enum power_supply_property energy_battery_full_cap_broken_props[] = {
362 POWER_SUPPLY_PROP_STATUS,
363 POWER_SUPPLY_PROP_PRESENT,
364 POWER_SUPPLY_PROP_TECHNOLOGY,
365 POWER_SUPPLY_PROP_CYCLE_COUNT,
366 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
367 POWER_SUPPLY_PROP_VOLTAGE_NOW,
368 POWER_SUPPLY_PROP_POWER_NOW,
369 POWER_SUPPLY_PROP_ENERGY_NOW,
370 POWER_SUPPLY_PROP_MODEL_NAME,
371 POWER_SUPPLY_PROP_MANUFACTURER,
372 POWER_SUPPLY_PROP_SERIAL_NUMBER,
373 };
374
375 /* Battery Management */
376 struct acpi_offsets {
377 size_t offset; /* offset inside struct acpi_sbs_battery */
378 u8 mode; /* int or string? */
379 };
380
381 static const struct acpi_offsets state_offsets[] = {
382 {offsetof(struct acpi_battery, state), 0},
383 {offsetof(struct acpi_battery, rate_now), 0},
384 {offsetof(struct acpi_battery, capacity_now), 0},
385 {offsetof(struct acpi_battery, voltage_now), 0},
386 };
387
388 static const struct acpi_offsets info_offsets[] = {
389 {offsetof(struct acpi_battery, power_unit), 0},
390 {offsetof(struct acpi_battery, design_capacity), 0},
391 {offsetof(struct acpi_battery, full_charge_capacity), 0},
392 {offsetof(struct acpi_battery, technology), 0},
393 {offsetof(struct acpi_battery, design_voltage), 0},
394 {offsetof(struct acpi_battery, design_capacity_warning), 0},
395 {offsetof(struct acpi_battery, design_capacity_low), 0},
396 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
397 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
398 {offsetof(struct acpi_battery, model_number), 1},
399 {offsetof(struct acpi_battery, serial_number), 1},
400 {offsetof(struct acpi_battery, type), 1},
401 {offsetof(struct acpi_battery, oem_info), 1},
402 };
403
404 static const struct acpi_offsets extended_info_offsets[] = {
405 {offsetof(struct acpi_battery, revision), 0},
406 {offsetof(struct acpi_battery, power_unit), 0},
407 {offsetof(struct acpi_battery, design_capacity), 0},
408 {offsetof(struct acpi_battery, full_charge_capacity), 0},
409 {offsetof(struct acpi_battery, technology), 0},
410 {offsetof(struct acpi_battery, design_voltage), 0},
411 {offsetof(struct acpi_battery, design_capacity_warning), 0},
412 {offsetof(struct acpi_battery, design_capacity_low), 0},
413 {offsetof(struct acpi_battery, cycle_count), 0},
414 {offsetof(struct acpi_battery, measurement_accuracy), 0},
415 {offsetof(struct acpi_battery, max_sampling_time), 0},
416 {offsetof(struct acpi_battery, min_sampling_time), 0},
417 {offsetof(struct acpi_battery, max_averaging_interval), 0},
418 {offsetof(struct acpi_battery, min_averaging_interval), 0},
419 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
420 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
421 {offsetof(struct acpi_battery, model_number), 1},
422 {offsetof(struct acpi_battery, serial_number), 1},
423 {offsetof(struct acpi_battery, type), 1},
424 {offsetof(struct acpi_battery, oem_info), 1},
425 };
426
extract_package(struct acpi_battery * battery,union acpi_object * package,const struct acpi_offsets * offsets,int num)427 static int extract_package(struct acpi_battery *battery,
428 union acpi_object *package,
429 const struct acpi_offsets *offsets, int num)
430 {
431 int i;
432 union acpi_object *element;
433
434 if (package->type != ACPI_TYPE_PACKAGE)
435 return -EFAULT;
436 for (i = 0; i < num; ++i) {
437 if (package->package.count <= i)
438 return -EFAULT;
439 element = &package->package.elements[i];
440 if (offsets[i].mode) {
441 u8 *ptr = (u8 *)battery + offsets[i].offset;
442 u32 len = MAX_STRING_LENGTH;
443
444 switch (element->type) {
445 case ACPI_TYPE_BUFFER:
446 if (len > element->buffer.length + 1)
447 len = element->buffer.length + 1;
448
449 fallthrough;
450 case ACPI_TYPE_STRING:
451 strscpy(ptr, element->string.pointer, len);
452
453 break;
454 case ACPI_TYPE_INTEGER:
455 strscpy(ptr, (u8 *)&element->integer.value, sizeof(u64) + 1);
456
457 break;
458 default:
459 *ptr = 0; /* don't have value */
460 }
461 } else {
462 int *x = (int *)((u8 *)battery + offsets[i].offset);
463 *x = (element->type == ACPI_TYPE_INTEGER) ?
464 element->integer.value : -1;
465 }
466 }
467 return 0;
468 }
469
acpi_battery_get_status(struct acpi_battery * battery)470 static int acpi_battery_get_status(struct acpi_battery *battery)
471 {
472 if (acpi_bus_get_status(battery->device)) {
473 acpi_handle_info(battery->device->handle,
474 "_STA evaluation failed\n");
475 return -ENODEV;
476 }
477 return 0;
478 }
479
480
extract_battery_info(const int use_bix,struct acpi_battery * battery,const struct acpi_buffer * buffer)481 static int extract_battery_info(const int use_bix,
482 struct acpi_battery *battery,
483 const struct acpi_buffer *buffer)
484 {
485 int result = -EFAULT;
486
487 if (use_bix && battery_bix_broken_package)
488 result = extract_package(battery, buffer->pointer,
489 extended_info_offsets + 1,
490 ARRAY_SIZE(extended_info_offsets) - 1);
491 else if (use_bix)
492 result = extract_package(battery, buffer->pointer,
493 extended_info_offsets,
494 ARRAY_SIZE(extended_info_offsets));
495 else
496 result = extract_package(battery, buffer->pointer,
497 info_offsets, ARRAY_SIZE(info_offsets));
498 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
499 battery->full_charge_capacity = battery->design_capacity;
500 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
501 battery->power_unit && battery->design_voltage) {
502 battery->design_capacity = battery->design_capacity *
503 10000 / battery->design_voltage;
504 battery->full_charge_capacity = battery->full_charge_capacity *
505 10000 / battery->design_voltage;
506 battery->design_capacity_warning =
507 battery->design_capacity_warning *
508 10000 / battery->design_voltage;
509 /* Curiously, design_capacity_low, unlike the rest of them,
510 * is correct.
511 */
512 /* capacity_granularity_* equal 1 on the systems tested, so
513 * it's impossible to tell if they would need an adjustment
514 * or not if their values were higher.
515 */
516 }
517 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
518 battery->capacity_now > battery->full_charge_capacity)
519 battery->capacity_now = battery->full_charge_capacity;
520
521 return result;
522 }
523
acpi_battery_get_info(struct acpi_battery * battery)524 static int acpi_battery_get_info(struct acpi_battery *battery)
525 {
526 const int xinfo = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
527 int use_bix;
528 int result = -ENODEV;
529
530 if (!acpi_battery_present(battery))
531 return 0;
532
533
534 for (use_bix = xinfo ? 1 : 0; use_bix >= 0; use_bix--) {
535 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
536 acpi_status status = AE_ERROR;
537
538 mutex_lock(&battery->lock);
539 status = acpi_evaluate_object(battery->device->handle,
540 use_bix ? "_BIX":"_BIF",
541 NULL, &buffer);
542 mutex_unlock(&battery->lock);
543
544 if (ACPI_FAILURE(status)) {
545 acpi_handle_info(battery->device->handle,
546 "%s evaluation failed: %s\n",
547 use_bix ? "_BIX":"_BIF",
548 acpi_format_exception(status));
549 } else {
550 result = extract_battery_info(use_bix,
551 battery,
552 &buffer);
553
554 kfree(buffer.pointer);
555 break;
556 }
557 }
558
559 if (!result && !use_bix && xinfo)
560 pr_warn(FW_BUG "The _BIX method is broken, using _BIF.\n");
561
562 return result;
563 }
564
acpi_battery_get_state(struct acpi_battery * battery)565 static int acpi_battery_get_state(struct acpi_battery *battery)
566 {
567 int result = 0;
568 acpi_status status = 0;
569 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
570
571 if (!acpi_battery_present(battery))
572 return 0;
573
574 if (battery->update_time &&
575 time_before(jiffies, battery->update_time +
576 msecs_to_jiffies(cache_time)))
577 return 0;
578
579 mutex_lock(&battery->lock);
580 status = acpi_evaluate_object(battery->device->handle, "_BST",
581 NULL, &buffer);
582 mutex_unlock(&battery->lock);
583
584 if (ACPI_FAILURE(status)) {
585 acpi_handle_info(battery->device->handle,
586 "_BST evaluation failed: %s",
587 acpi_format_exception(status));
588 return -ENODEV;
589 }
590
591 result = extract_package(battery, buffer.pointer,
592 state_offsets, ARRAY_SIZE(state_offsets));
593 battery->update_time = jiffies;
594 kfree(buffer.pointer);
595
596 /* For buggy DSDTs that report negative 16-bit values for either
597 * charging or discharging current and/or report 0 as 65536
598 * due to bad math.
599 */
600 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA &&
601 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
602 (s16)(battery->rate_now) < 0) {
603 battery->rate_now = abs((s16)battery->rate_now);
604 pr_warn_once(FW_BUG "(dis)charge rate invalid.\n");
605 }
606
607 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
608 && battery->capacity_now >= 0 && battery->capacity_now <= 100)
609 battery->capacity_now = (battery->capacity_now *
610 battery->full_charge_capacity) / 100;
611 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
612 battery->power_unit && battery->design_voltage) {
613 battery->capacity_now = battery->capacity_now *
614 10000 / battery->design_voltage;
615 }
616 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
617 battery->capacity_now > battery->full_charge_capacity)
618 battery->capacity_now = battery->full_charge_capacity;
619
620 return result;
621 }
622
acpi_battery_set_alarm(struct acpi_battery * battery)623 static int acpi_battery_set_alarm(struct acpi_battery *battery)
624 {
625 acpi_status status = 0;
626
627 if (!acpi_battery_present(battery) ||
628 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
629 return -ENODEV;
630
631 mutex_lock(&battery->lock);
632 status = acpi_execute_simple_method(battery->device->handle, "_BTP",
633 battery->alarm);
634 mutex_unlock(&battery->lock);
635
636 if (ACPI_FAILURE(status))
637 return -ENODEV;
638
639 acpi_handle_debug(battery->device->handle, "Alarm set to %d\n",
640 battery->alarm);
641
642 return 0;
643 }
644
acpi_battery_init_alarm(struct acpi_battery * battery)645 static int acpi_battery_init_alarm(struct acpi_battery *battery)
646 {
647 /* See if alarms are supported, and if so, set default */
648 if (!acpi_has_method(battery->device->handle, "_BTP")) {
649 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
650 return 0;
651 }
652 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
653 if (!battery->alarm)
654 battery->alarm = battery->design_capacity_warning;
655 return acpi_battery_set_alarm(battery);
656 }
657
acpi_battery_alarm_show(struct device * dev,struct device_attribute * attr,char * buf)658 static ssize_t acpi_battery_alarm_show(struct device *dev,
659 struct device_attribute *attr,
660 char *buf)
661 {
662 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
663
664 return sysfs_emit(buf, "%d\n", battery->alarm * 1000);
665 }
666
acpi_battery_alarm_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)667 static ssize_t acpi_battery_alarm_store(struct device *dev,
668 struct device_attribute *attr,
669 const char *buf, size_t count)
670 {
671 unsigned long x;
672 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
673
674 if (sscanf(buf, "%lu\n", &x) == 1)
675 battery->alarm = x/1000;
676 if (acpi_battery_present(battery))
677 acpi_battery_set_alarm(battery);
678 return count;
679 }
680
681 static struct device_attribute alarm_attr = {
682 .attr = {.name = "alarm", .mode = 0644},
683 .show = acpi_battery_alarm_show,
684 .store = acpi_battery_alarm_store,
685 };
686
687 static struct attribute *acpi_battery_attrs[] = {
688 &alarm_attr.attr,
689 NULL
690 };
691 ATTRIBUTE_GROUPS(acpi_battery);
692
693 /*
694 * The Battery Hooking API
695 *
696 * This API is used inside other drivers that need to expose
697 * platform-specific behaviour within the generic driver in a
698 * generic way.
699 *
700 */
701
702 static LIST_HEAD(acpi_battery_list);
703 static LIST_HEAD(battery_hook_list);
704 static DEFINE_MUTEX(hook_mutex);
705
__battery_hook_unregister(struct acpi_battery_hook * hook,int lock)706 static void __battery_hook_unregister(struct acpi_battery_hook *hook, int lock)
707 {
708 struct acpi_battery *battery;
709 /*
710 * In order to remove a hook, we first need to
711 * de-register all the batteries that are registered.
712 */
713 if (lock)
714 mutex_lock(&hook_mutex);
715 list_for_each_entry(battery, &acpi_battery_list, list) {
716 if (!hook->remove_battery(battery->bat, hook))
717 power_supply_changed(battery->bat);
718 }
719 list_del(&hook->list);
720 if (lock)
721 mutex_unlock(&hook_mutex);
722 pr_info("extension unregistered: %s\n", hook->name);
723 }
724
battery_hook_unregister(struct acpi_battery_hook * hook)725 void battery_hook_unregister(struct acpi_battery_hook *hook)
726 {
727 __battery_hook_unregister(hook, 1);
728 }
729 EXPORT_SYMBOL_GPL(battery_hook_unregister);
730
battery_hook_register(struct acpi_battery_hook * hook)731 void battery_hook_register(struct acpi_battery_hook *hook)
732 {
733 struct acpi_battery *battery;
734
735 mutex_lock(&hook_mutex);
736 INIT_LIST_HEAD(&hook->list);
737 list_add(&hook->list, &battery_hook_list);
738 /*
739 * Now that the driver is registered, we need
740 * to notify the hook that a battery is available
741 * for each battery, so that the driver may add
742 * its attributes.
743 */
744 list_for_each_entry(battery, &acpi_battery_list, list) {
745 if (hook->add_battery(battery->bat, hook)) {
746 /*
747 * If a add-battery returns non-zero,
748 * the registration of the extension has failed,
749 * and we will not add it to the list of loaded
750 * hooks.
751 */
752 pr_err("extension failed to load: %s", hook->name);
753 __battery_hook_unregister(hook, 0);
754 goto end;
755 }
756
757 power_supply_changed(battery->bat);
758 }
759 pr_info("new extension: %s\n", hook->name);
760 end:
761 mutex_unlock(&hook_mutex);
762 }
763 EXPORT_SYMBOL_GPL(battery_hook_register);
764
devm_battery_hook_unregister(void * data)765 static void devm_battery_hook_unregister(void *data)
766 {
767 struct acpi_battery_hook *hook = data;
768
769 battery_hook_unregister(hook);
770 }
771
devm_battery_hook_register(struct device * dev,struct acpi_battery_hook * hook)772 int devm_battery_hook_register(struct device *dev, struct acpi_battery_hook *hook)
773 {
774 battery_hook_register(hook);
775
776 return devm_add_action_or_reset(dev, devm_battery_hook_unregister, hook);
777 }
778 EXPORT_SYMBOL_GPL(devm_battery_hook_register);
779
780 /*
781 * This function gets called right after the battery sysfs
782 * attributes have been added, so that the drivers that
783 * define custom sysfs attributes can add their own.
784 */
battery_hook_add_battery(struct acpi_battery * battery)785 static void battery_hook_add_battery(struct acpi_battery *battery)
786 {
787 struct acpi_battery_hook *hook_node, *tmp;
788
789 mutex_lock(&hook_mutex);
790 INIT_LIST_HEAD(&battery->list);
791 list_add(&battery->list, &acpi_battery_list);
792 /*
793 * Since we added a new battery to the list, we need to
794 * iterate over the hooks and call add_battery for each
795 * hook that was registered. This usually happens
796 * when a battery gets hotplugged or initialized
797 * during the battery module initialization.
798 */
799 list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) {
800 if (hook_node->add_battery(battery->bat, hook_node)) {
801 /*
802 * The notification of the extensions has failed, to
803 * prevent further errors we will unload the extension.
804 */
805 pr_err("error in extension, unloading: %s",
806 hook_node->name);
807 __battery_hook_unregister(hook_node, 0);
808 }
809 }
810 mutex_unlock(&hook_mutex);
811 }
812
battery_hook_remove_battery(struct acpi_battery * battery)813 static void battery_hook_remove_battery(struct acpi_battery *battery)
814 {
815 struct acpi_battery_hook *hook;
816
817 mutex_lock(&hook_mutex);
818 /*
819 * Before removing the hook, we need to remove all
820 * custom attributes from the battery.
821 */
822 list_for_each_entry(hook, &battery_hook_list, list) {
823 hook->remove_battery(battery->bat, hook);
824 }
825 /* Then, just remove the battery from the list */
826 list_del(&battery->list);
827 mutex_unlock(&hook_mutex);
828 }
829
battery_hook_exit(void)830 static void __exit battery_hook_exit(void)
831 {
832 struct acpi_battery_hook *hook;
833 struct acpi_battery_hook *ptr;
834 /*
835 * At this point, the acpi_bus_unregister_driver()
836 * has called remove for all batteries. We just
837 * need to remove the hooks.
838 */
839 list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) {
840 __battery_hook_unregister(hook, 1);
841 }
842 mutex_destroy(&hook_mutex);
843 }
844
sysfs_add_battery(struct acpi_battery * battery)845 static int sysfs_add_battery(struct acpi_battery *battery)
846 {
847 struct power_supply_config psy_cfg = {
848 .drv_data = battery,
849 .attr_grp = acpi_battery_groups,
850 };
851 bool full_cap_broken = false;
852
853 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) &&
854 !ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
855 full_cap_broken = true;
856
857 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
858 if (full_cap_broken) {
859 battery->bat_desc.properties =
860 charge_battery_full_cap_broken_props;
861 battery->bat_desc.num_properties =
862 ARRAY_SIZE(charge_battery_full_cap_broken_props);
863 } else {
864 battery->bat_desc.properties = charge_battery_props;
865 battery->bat_desc.num_properties =
866 ARRAY_SIZE(charge_battery_props);
867 }
868 } else {
869 if (full_cap_broken) {
870 battery->bat_desc.properties =
871 energy_battery_full_cap_broken_props;
872 battery->bat_desc.num_properties =
873 ARRAY_SIZE(energy_battery_full_cap_broken_props);
874 } else {
875 battery->bat_desc.properties = energy_battery_props;
876 battery->bat_desc.num_properties =
877 ARRAY_SIZE(energy_battery_props);
878 }
879 }
880
881 battery->bat_desc.name = acpi_device_bid(battery->device);
882 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
883 battery->bat_desc.get_property = acpi_battery_get_property;
884
885 battery->bat = power_supply_register_no_ws(&battery->device->dev,
886 &battery->bat_desc, &psy_cfg);
887
888 if (IS_ERR(battery->bat)) {
889 int result = PTR_ERR(battery->bat);
890
891 battery->bat = NULL;
892 return result;
893 }
894 battery_hook_add_battery(battery);
895 return 0;
896 }
897
sysfs_remove_battery(struct acpi_battery * battery)898 static void sysfs_remove_battery(struct acpi_battery *battery)
899 {
900 mutex_lock(&battery->sysfs_lock);
901 if (!battery->bat) {
902 mutex_unlock(&battery->sysfs_lock);
903 return;
904 }
905 battery_hook_remove_battery(battery);
906 power_supply_unregister(battery->bat);
907 battery->bat = NULL;
908 mutex_unlock(&battery->sysfs_lock);
909 }
910
find_battery(const struct dmi_header * dm,void * private)911 static void find_battery(const struct dmi_header *dm, void *private)
912 {
913 struct acpi_battery *battery = (struct acpi_battery *)private;
914 /* Note: the hardcoded offsets below have been extracted from
915 * the source code of dmidecode.
916 */
917 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) {
918 const u8 *dmi_data = (const u8 *)(dm + 1);
919 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6));
920
921 if (dm->length >= 18)
922 dmi_capacity *= dmi_data[17];
923 if (battery->design_capacity * battery->design_voltage / 1000
924 != dmi_capacity &&
925 battery->design_capacity * 10 == dmi_capacity)
926 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
927 &battery->flags);
928 }
929 }
930
931 /*
932 * According to the ACPI spec, some kinds of primary batteries can
933 * report percentage battery remaining capacity directly to OS.
934 * In this case, it reports the Last Full Charged Capacity == 100
935 * and BatteryPresentRate == 0xFFFFFFFF.
936 *
937 * Now we found some battery reports percentage remaining capacity
938 * even if it's rechargeable.
939 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
940 *
941 * Handle this correctly so that they won't break userspace.
942 */
acpi_battery_quirks(struct acpi_battery * battery)943 static void acpi_battery_quirks(struct acpi_battery *battery)
944 {
945 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
946 return;
947
948 if (battery->full_charge_capacity == 100 &&
949 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
950 battery->capacity_now >= 0 && battery->capacity_now <= 100) {
951 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
952 battery->full_charge_capacity = battery->design_capacity;
953 battery->capacity_now = (battery->capacity_now *
954 battery->full_charge_capacity) / 100;
955 }
956
957 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags))
958 return;
959
960 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) {
961 const char *s;
962
963 s = dmi_get_system_info(DMI_PRODUCT_VERSION);
964 if (s && !strncasecmp(s, "ThinkPad", 8)) {
965 dmi_walk(find_battery, battery);
966 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
967 &battery->flags) &&
968 battery->design_voltage) {
969 battery->design_capacity =
970 battery->design_capacity *
971 10000 / battery->design_voltage;
972 battery->full_charge_capacity =
973 battery->full_charge_capacity *
974 10000 / battery->design_voltage;
975 battery->design_capacity_warning =
976 battery->design_capacity_warning *
977 10000 / battery->design_voltage;
978 battery->capacity_now = battery->capacity_now *
979 10000 / battery->design_voltage;
980 }
981 }
982 }
983
984 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags))
985 return;
986
987 if (acpi_battery_is_degraded(battery) &&
988 battery->capacity_now > battery->full_charge_capacity) {
989 set_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags);
990 battery->capacity_now = battery->full_charge_capacity;
991 }
992 }
993
acpi_battery_update(struct acpi_battery * battery,bool resume)994 static int acpi_battery_update(struct acpi_battery *battery, bool resume)
995 {
996 int result = acpi_battery_get_status(battery);
997
998 if (result)
999 return result;
1000
1001 if (!acpi_battery_present(battery)) {
1002 sysfs_remove_battery(battery);
1003 battery->update_time = 0;
1004 return 0;
1005 }
1006
1007 if (resume)
1008 return 0;
1009
1010 if (!battery->update_time) {
1011 result = acpi_battery_get_info(battery);
1012 if (result)
1013 return result;
1014 acpi_battery_init_alarm(battery);
1015 }
1016
1017 result = acpi_battery_get_state(battery);
1018 if (result)
1019 return result;
1020 acpi_battery_quirks(battery);
1021
1022 if (!battery->bat) {
1023 result = sysfs_add_battery(battery);
1024 if (result)
1025 return result;
1026 }
1027
1028 /*
1029 * Wakeup the system if battery is critical low
1030 * or lower than the alarm level
1031 */
1032 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) ||
1033 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
1034 (battery->capacity_now <= battery->alarm)))
1035 acpi_pm_wakeup_event(&battery->device->dev);
1036
1037 return result;
1038 }
1039
acpi_battery_refresh(struct acpi_battery * battery)1040 static void acpi_battery_refresh(struct acpi_battery *battery)
1041 {
1042 int power_unit;
1043
1044 if (!battery->bat)
1045 return;
1046
1047 power_unit = battery->power_unit;
1048
1049 acpi_battery_get_info(battery);
1050
1051 if (power_unit == battery->power_unit)
1052 return;
1053
1054 /* The battery has changed its reporting units. */
1055 sysfs_remove_battery(battery);
1056 sysfs_add_battery(battery);
1057 }
1058
1059 /* Driver Interface */
acpi_battery_notify(acpi_handle handle,u32 event,void * data)1060 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
1061 {
1062 struct acpi_device *device = data;
1063 struct acpi_battery *battery = acpi_driver_data(device);
1064 struct power_supply *old;
1065
1066 if (!battery)
1067 return;
1068 old = battery->bat;
1069 /*
1070 * On Acer Aspire V5-573G notifications are sometimes triggered too
1071 * early. For example, when AC is unplugged and notification is
1072 * triggered, battery state is still reported as "Full", and changes to
1073 * "Discharging" only after short delay, without any notification.
1074 */
1075 if (battery_notification_delay_ms > 0)
1076 msleep(battery_notification_delay_ms);
1077 if (event == ACPI_BATTERY_NOTIFY_INFO)
1078 acpi_battery_refresh(battery);
1079 acpi_battery_update(battery, false);
1080 acpi_bus_generate_netlink_event(device->pnp.device_class,
1081 dev_name(&device->dev), event,
1082 acpi_battery_present(battery));
1083 acpi_notifier_call_chain(device, event, acpi_battery_present(battery));
1084 /* acpi_battery_update could remove power_supply object */
1085 if (old && battery->bat)
1086 power_supply_changed(battery->bat);
1087 }
1088
battery_notify(struct notifier_block * nb,unsigned long mode,void * _unused)1089 static int battery_notify(struct notifier_block *nb,
1090 unsigned long mode, void *_unused)
1091 {
1092 struct acpi_battery *battery = container_of(nb, struct acpi_battery,
1093 pm_nb);
1094 int result;
1095
1096 switch (mode) {
1097 case PM_POST_HIBERNATION:
1098 case PM_POST_SUSPEND:
1099 if (!acpi_battery_present(battery))
1100 return 0;
1101
1102 if (battery->bat) {
1103 acpi_battery_refresh(battery);
1104 } else {
1105 result = acpi_battery_get_info(battery);
1106 if (result)
1107 return result;
1108
1109 result = sysfs_add_battery(battery);
1110 if (result)
1111 return result;
1112 }
1113
1114 acpi_battery_init_alarm(battery);
1115 acpi_battery_get_state(battery);
1116 break;
1117 }
1118
1119 return 0;
1120 }
1121
1122 static int __init
battery_bix_broken_package_quirk(const struct dmi_system_id * d)1123 battery_bix_broken_package_quirk(const struct dmi_system_id *d)
1124 {
1125 battery_bix_broken_package = 1;
1126 return 0;
1127 }
1128
1129 static int __init
battery_notification_delay_quirk(const struct dmi_system_id * d)1130 battery_notification_delay_quirk(const struct dmi_system_id *d)
1131 {
1132 battery_notification_delay_ms = 1000;
1133 return 0;
1134 }
1135
1136 static int __init
battery_ac_is_broken_quirk(const struct dmi_system_id * d)1137 battery_ac_is_broken_quirk(const struct dmi_system_id *d)
1138 {
1139 battery_ac_is_broken = 1;
1140 return 0;
1141 }
1142
1143 static const struct dmi_system_id bat_dmi_table[] __initconst = {
1144 {
1145 /* NEC LZ750/LS */
1146 .callback = battery_bix_broken_package_quirk,
1147 .matches = {
1148 DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
1149 DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"),
1150 },
1151 },
1152 {
1153 /* Acer Aspire V5-573G */
1154 .callback = battery_notification_delay_quirk,
1155 .matches = {
1156 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1157 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"),
1158 },
1159 },
1160 {
1161 /* Point of View mobii wintab p800w */
1162 .callback = battery_ac_is_broken_quirk,
1163 .matches = {
1164 DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
1165 DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB"),
1166 DMI_MATCH(DMI_BIOS_VERSION, "3BAIR1013"),
1167 /* Above matches are too generic, add bios-date match */
1168 DMI_MATCH(DMI_BIOS_DATE, "08/22/2014"),
1169 },
1170 },
1171 {
1172 /* Microsoft Surface Go 3 */
1173 .callback = battery_notification_delay_quirk,
1174 .matches = {
1175 DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
1176 DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go 3"),
1177 },
1178 },
1179 {},
1180 };
1181
1182 /*
1183 * Some machines'(E,G Lenovo Z480) ECs are not stable
1184 * during boot up and this causes battery driver fails to be
1185 * probed due to failure of getting battery information
1186 * from EC sometimes. After several retries, the operation
1187 * may work. So add retry code here and 20ms sleep between
1188 * every retries.
1189 */
acpi_battery_update_retry(struct acpi_battery * battery)1190 static int acpi_battery_update_retry(struct acpi_battery *battery)
1191 {
1192 int retry, ret;
1193
1194 for (retry = 5; retry; retry--) {
1195 ret = acpi_battery_update(battery, false);
1196 if (!ret)
1197 break;
1198
1199 msleep(20);
1200 }
1201 return ret;
1202 }
1203
acpi_battery_add(struct acpi_device * device)1204 static int acpi_battery_add(struct acpi_device *device)
1205 {
1206 int result = 0;
1207 struct acpi_battery *battery;
1208
1209 if (!device)
1210 return -EINVAL;
1211
1212 if (device->dep_unmet)
1213 return -EPROBE_DEFER;
1214
1215 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
1216 if (!battery)
1217 return -ENOMEM;
1218 battery->device = device;
1219 strscpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
1220 strscpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
1221 device->driver_data = battery;
1222 mutex_init(&battery->lock);
1223 mutex_init(&battery->sysfs_lock);
1224 if (acpi_has_method(battery->device->handle, "_BIX"))
1225 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
1226
1227 result = acpi_battery_update_retry(battery);
1228 if (result)
1229 goto fail;
1230
1231 pr_info("Slot [%s] (battery %s)\n", acpi_device_bid(device),
1232 device->status.battery_present ? "present" : "absent");
1233
1234 battery->pm_nb.notifier_call = battery_notify;
1235 register_pm_notifier(&battery->pm_nb);
1236
1237 device_init_wakeup(&device->dev, 1);
1238
1239 result = acpi_dev_install_notify_handler(device, ACPI_ALL_NOTIFY,
1240 acpi_battery_notify, device);
1241 if (result)
1242 goto fail_pm;
1243
1244 return 0;
1245
1246 fail_pm:
1247 device_init_wakeup(&device->dev, 0);
1248 unregister_pm_notifier(&battery->pm_nb);
1249 fail:
1250 sysfs_remove_battery(battery);
1251 mutex_destroy(&battery->lock);
1252 mutex_destroy(&battery->sysfs_lock);
1253 kfree(battery);
1254
1255 return result;
1256 }
1257
acpi_battery_remove(struct acpi_device * device)1258 static void acpi_battery_remove(struct acpi_device *device)
1259 {
1260 struct acpi_battery *battery;
1261
1262 if (!device || !acpi_driver_data(device))
1263 return;
1264
1265 battery = acpi_driver_data(device);
1266
1267 acpi_dev_remove_notify_handler(device, ACPI_ALL_NOTIFY,
1268 acpi_battery_notify);
1269
1270 device_init_wakeup(&device->dev, 0);
1271 unregister_pm_notifier(&battery->pm_nb);
1272 sysfs_remove_battery(battery);
1273
1274 mutex_destroy(&battery->lock);
1275 mutex_destroy(&battery->sysfs_lock);
1276 kfree(battery);
1277 }
1278
1279 #ifdef CONFIG_PM_SLEEP
1280 /* this is needed to learn about changes made in suspended state */
acpi_battery_resume(struct device * dev)1281 static int acpi_battery_resume(struct device *dev)
1282 {
1283 struct acpi_battery *battery;
1284
1285 if (!dev)
1286 return -EINVAL;
1287
1288 battery = acpi_driver_data(to_acpi_device(dev));
1289 if (!battery)
1290 return -EINVAL;
1291
1292 battery->update_time = 0;
1293 acpi_battery_update(battery, true);
1294 return 0;
1295 }
1296 #else
1297 #define acpi_battery_resume NULL
1298 #endif
1299
1300 static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume);
1301
1302 static struct acpi_driver acpi_battery_driver = {
1303 .name = "battery",
1304 .class = ACPI_BATTERY_CLASS,
1305 .ids = battery_device_ids,
1306 .ops = {
1307 .add = acpi_battery_add,
1308 .remove = acpi_battery_remove,
1309 },
1310 .drv.pm = &acpi_battery_pm,
1311 .drv.probe_type = PROBE_PREFER_ASYNCHRONOUS,
1312 };
1313
acpi_battery_init(void)1314 static int __init acpi_battery_init(void)
1315 {
1316 if (acpi_disabled || acpi_quirk_skip_acpi_ac_and_battery())
1317 return -ENODEV;
1318
1319 dmi_check_system(bat_dmi_table);
1320
1321 return acpi_bus_register_driver(&acpi_battery_driver);
1322 }
1323
acpi_battery_exit(void)1324 static void __exit acpi_battery_exit(void)
1325 {
1326 acpi_bus_unregister_driver(&acpi_battery_driver);
1327 battery_hook_exit();
1328 }
1329
1330 module_init(acpi_battery_init);
1331 module_exit(acpi_battery_exit);
1332